<?php
/*
	+-----------------------------------------------------------------------------+
	| ILIAS open source                                                           |
	+-----------------------------------------------------------------------------+
	| Copyright (c) 1998-2001 ILIAS open source, University of Cologne            |
	|                                                                             |
	| This program is free software; you can redistribute it and/or               |
	| modify it under the terms of the GNU General Public License                 |
	| as published by the Free Software Foundation; either version 2              |
	| of the License, or (at your option) any later version.                      |
	|                                                                             |
	| This program is distributed in the hope that it will be useful,             |
	| but WITHOUT ANY WARRANTY; without even the implied warranty of              |
	| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
	| GNU General Public License for more details.                                |
	|                                                                             |
	| You should have received a copy of the GNU General Public License           |
	| along with this program; if not, write to the Free Software                 |
	| Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
	+-----------------------------------------------------------------------------+
*/

include_once("classes/class.ilObjectAccess.php");

/**
* Class ilObjCourseAccess
*
*
* @author Alex Killing <alex.killing@gmx.de>
* @version $Id: class.ilObjCourseAccess.php 20236 2009-06-16 19:11:09Z smeyer $
*
*/
class ilObjCourseAccess extends ilObjectAccess
{
	/**
	* checks wether a user may invoke a command or not
	* (this method is called by ilAccessHandler::checkAccess)
	*
	* @param	string		$a_cmd		command (not permission!)
	* @param	string		$a_permission	permission
	* @param	int			$a_ref_id	reference id
	* @param	int			$a_obj_id	object id
	* @param	int			$a_user_id	user id (if not provided, current user is taken)
	*
	* @return	boolean		true, if everything is ok
	*/
	function _checkAccess($a_cmd, $a_permission, $a_ref_id, $a_obj_id, $a_user_id = "")
	{
		global $ilUser, $lng, $rbacsystem, $ilAccess, $ilias;

		if ($a_user_id == "")
		{
			$a_user_id = $ilUser->getId();
		}

		switch ($a_cmd)
		{
			case "view":
				include_once 'Modules/Course/classes/class.ilCourseParticipants.php';
				if(ilCourseParticipants::_isBlocked($a_obj_id,$a_user_id) and ilCourseParticipants::_isParticipant($a_ref_id,$a_user_id))
				{
					$ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $lng->txt("crs_status_blocked"));
					return false;
				} 
				/*				
				if($members->isBlocked($a_user_id) and $members->isAssigned($a_user_id))
				{
					$ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $lng->txt("crs_status_blocked"));
					return false;
				}
				*/					
				break;

			case 'join':
				
				include_once './Modules/Course/classes/class.ilObjCourse.php';
				$registration = ilObjCourse::_registrationEnabled($a_obj_id);

				if(!$registration)
				{
					return false;
				}

				include_once 'Modules/Course/classes/class.ilCourseParticipants.php';
				if(ilCourseParticipants::_isParticipant($a_ref_id,$a_user_id))
				{
					return false;
				}
				
				/*
				include_once 'Modules/Course/classes/class.ilCourseParticipants.php';

				$members = ilCourseParticipants::_getInstanceByObjId($a_obj_id);
				if($members->isAssigned($a_user_id))
				{
					return false;
				}
				*/				
				break;
		}

		switch ($a_permission)
		{
			case "visible":
				include_once './Modules/Course/classes/class.ilObjCourse.php';
				$active = ilObjCourse::_isActivated($a_obj_id);
				$registration = ilObjCourse::_registrationEnabled($a_obj_id);
				$tutor = $rbacsystem->checkAccessOfUser($a_user_id,'write',$a_ref_id);

				if(!$active)
				{
					$ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $lng->txt("offline"));
				}
				if(!$tutor and !$active)
				{
					return false;
				}
				break;

			case 'read':
				$tutor = $rbacsystem->checkAccessOfUser($a_user_id,'write',$a_ref_id);
				if($tutor)
				{
					return true;
				}				
				include_once 'Modules/Course/classes/class.ilObjCourse.php';
				$active = ilObjCourse::_isActivated($a_obj_id);

				if(!$active)
				{
					$ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $lng->txt("offline"));
					return false;
				}
				
				include_once('Modules/Course/classes/class.ilCourseParticipants.php');
				if(ilCourseParticipants::_isBlocked($a_obj_id,$a_user_id) and ilCourseParticipants::_isParticipant($a_ref_id,$a_user_id))
				{
					$ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $lng->txt("crs_status_blocked"));
					return false;
				} 
				
				/*
				$members = ilCourseParticipants::_getInstanceByObjId($a_obj_id);
				if($members->isBlocked($a_user_id) and $members->isAssigned($a_user_id))  
				{
					$ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $lng->txt("crs_status_blocked"));
					return false;
				}
				*/
				break;
		}
		return true;
	}

	/**
	 * get commands
	 * 
	 * this method returns an array of all possible commands/permission combinations
	 * 
	 * example:	
	 * $commands = array
	 *	(
	 *		array("permission" => "read", "cmd" => "view", "lang_var" => "show"),
	 *		array("permission" => "write", "cmd" => "edit", "lang_var" => "edit"),
	 *	);
	 */
	function _getCommands()
	{
		$commands = array();
		$commands[] = array("permission" => "read", "cmd" => "", "lang_var" => "view", "default" => true);
		$commands[] = array("permission" => "join", "cmd" => "join", "lang_var" => "join");
		// BEGIN WebDAV: Mount as webfolder.
		require_once 'Services/WebDAV/classes/class.ilDAVServer.php';
		if (ilDAVServer::_isActive() && ilDAVServer::_isActionsVisible())
		{
			$commands[] = array("permission" => "read", "cmd" => "mount_webfolder", "lang_var" => "mount_webfolder", "enable_anonymous" => "false");
		}
		// END WebDAV: Mount as webfolder.
		$commands[] = array("permission" => "write", "cmd" => "edit", "lang_var" => "edit");
		return $commands;
	}
	
	/**
	* check whether goto script will succeed
	*/
	function _checkGoto($a_target)
	{
		global $ilAccess;
		
		$t_arr = explode("_", $a_target);

		if ($t_arr[0] != "crs" || ((int) $t_arr[1]) <= 0)
		{
			return false;
		}

		if ($ilAccess->checkAccess("read", "", $t_arr[1]) ||
			$ilAccess->checkAccess("visible", "", $t_arr[1]))
		{
			return true;
		}
		return false;
	}
	
	/**
	 * Check if subscription is deactivated
	 * @return bool
	 * @param int $a_obj_id
	 */
	public static function isSelfRegistrationDeactivated($a_obj_id)
	{
		global $ilDB;
		
		include_once './Modules/Course/classes/class.ilObjCourse.php';
		$query = "SELECT subscription_limitation_type FROM crs_settings ".
			"WHERE obj_id = ".$ilDB->quote($a_obj_id);
		$res = $ilDB->query($query);
		$row = $res->fetchRow(DB_FETCHMODE_OBJECT);
		return $row->subscription_limitation_type == IL_CRS_SUBSCRIPTION_DEACTIVATED;
	}
}

?>
